Dockfile 生成Docker镜像文件大小的比较

下面就是我针对docker file同一个文件,按照layer层的个数的多少,分别构建了两个镜像的jenkins-master。两者大小相差300MB。

<1> layer层数太多,没有将命令合并为一条命令

FROM jenkins/jenkins:2.194
MAINTAINER tiandong9860806@linuxidc.com
USER root

ENV MAVEN_HOME /usr/local/maven
ENV Java_HOME /usr/local/java
ENV M2=/usr/local/maven/repository
ENV CLASSPATH .:$JAVA_HOME/lib:$M2_HOME/lib
ENV PATH $MAVEN_HOME/bin:$JAVA_HOME/bin:$PATH

RUN mkdir -p /usr/local/java
RUN mkdir -p /usr/local/maven/repository

COPY soft/apache-maven-3.5.4/* /usr/local/
COPY soft/jre1.8.0_212/* /usr/local/java/

<2> layer层数很少,将全部命令合并为一条命令

FROM jenkins/jenkins:2.194
MAINTAINER tiandong9860806@linuxidc.com

USER root && \
ENV MAVEN_HOME /usr/local/maven && \
ENV JAVA_HOME /usr/local/java && \
ENV M2 /usr/local/maven/repository && \
ENV CLASSPATH .:$JAVA_HOME/lib:$M2_HOME/lib && \
ENV PATH $MAVEN_HOME/bin:$JAVA_HOME/bin:$PATH && \

RUN mkdir -p /usr/local/java && \
RUN mkdir -p /usr/local/maven/repository && \

COPY soft/apache-maven-3.5.4/* /usr/local/ && \
COPY soft/jre1.8.0_212/* /usr/local/java/

然后,分别执行构建命令

root >> cd /opt/dockerfile/jenkins/02/

root >> docker build -f /opt/dockerfile/jenkins/02/jenkins-master-01.Dockerfile . -t registry.cn-hangzhou.aliyuncs.com/kevin_docker_registry/mirror_k8s_jenkins-master:2.194

root >> docker build -f /opt/dockerfile/jenkins/02/jenkins-master-02.Dockerfile . -t registry.cn-hangzhou.aliyuncs.com/kevin_docker_registry/mirror_k8s_jenkins-master:2.194-test

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最后,我们检查结果

发现第二个dockerfile生成的镜像文件大小要比前者体积小300MB。

root >> docker images

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附录:

如果需要,我们还可以将生成好的jenkins-master提交到阿里云的仓库,命令参考如下

root >> docker login –username=kevin@1522315893340281 registry.cn-hangzhou.aliyuncs.com/kevin_docker_registry/mirror_k8s_jenkins-master
root >> docker tag db8450d6f4f0 registry.cn-hangzhou.aliyuncs.com/kevin_docker_registry/mirror_k8s_jenkins-master:2.194
root >> docker push registry.cn-hangzhou.aliyuncs.com/kevin_docker_registry/mirror_k8s_jenkins-master:2.194

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上传完毕后,登录阿里云仓库,查看镜像版本,如

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文章来源:www.rakbuluo.com/p89

原文链接:,转发请注明来源!

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